Improvement in burglar-alarms



C. & J. BUHANON.

-B urglar-Alarm.

Patented Oct. 26,1875.

Fig. 7,

NPEIERS. PHOTO-LITHDGRAPHER, WASHINGTON. D c.

UNITED STATES PATENT OFFICE.

CLINTON BOHANON AND JOHN BOHANON, OF BROOKLINE, N. H.

IMPROVEMENT IN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 169,137, dated October26, 1875 application filed September 9, 1875.

To all whom it may concern Be it known that we, CLINTON BOHANON and JOHNBOHANON, of Brookline, of the county of Hillsborough and State of NewHampshire, have invented a new and useful Improvement in Burglar-Alarmsand do here by declare the same to be fully described in the followingspecification, and represented in the accompanying drawings, of which--Figure 1 is a perspective view of our improved alarm; Fig. 2 ahorizontal section, and Fig. 3 a vertical section, of it.

It is for application to a door-frame, and to be started into action bythe door while the latter may be in the act of being opened.

In the drawings, A denotes a case or box, containing a commonclock-alarm apparatus, B, and having in one edge a dovetailed groove, a,to receive a dovetailed tongue, b, of the attachment O. This latterviz.,the attachment Cis a thin plate of metal, of the form as shown, and isprovided with spurs c 0, ex-

' tended-from it at right angles. When used,

these spurs are to be driven into the inner side of a door-frame, sothat when the door is closed it shall hold the attachment in place, withits tongue b projecting from the doorframe into the room.

To apply the alarm to a door-frame, when the attachment is fixedthereto, the tongue b is to be inserted in the groove a, which it shouldclosely fit.

Within the box is a trigger, D, shaped as shown in Fig. 4. It is pivotedto a short shaft,

. E, arranged horizontally in the frame 6 of the I alarm. This triggerhas a curved slot, f, made in it, as shown, such slot, whenthe triggerprojects out of the case, being to receive a the alarm mechanism. Thesaid cock is a lever, which turns horizontally on a fulcrum, i, andserves, while in engagement with the alarm mechanism, to hold it fromsounding an alarm but, on being moved out ofengagelnent, sets free thesaid mechanism, to enable it to operate, so as to cause its bell It tobe rapidly struck by the hammer l. The trigger, when turned into avertical position, comes wholly within the box but when turned outhorizontally such trigger projects out of the box, or through anopeningin its edge, provided with a slide cover. The box has in its edge anopening, m, provided with a closing-slide, n. The trigger, whenhorizontal, projects through such opening; but when the trigger isvertical the opening may be closed by its cover, in which case thetrigger will be out of the way, or, in other words, entirely in thecase.

The alarm mechanism consists of a hell, it, a hammer, l, a shaft, 10,escapenient q, escapement-Wheel 'r, mainspring s, catch-wheel t,

pawl u, and its operative spring 'v, all being arranged as represented.

We claim as our invention as follows, viz:

The slotted trigger D and its supportingshaft, in combination with thealarm mechan ism B and the case A thereof, all being arranged, and thecock of the alarm being provided with a stud, g, to engage with the saidtrigger, as set forth.

CLINTON 'BOHAN ON.

- JOHN BOHANON.

Witnesses:

R. H. EDDY, J. It. SNow.

